IS 10959: Glossary of terms for sealants for building purposes (ISO 6927-1981)

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IS 10959 (1984) : Glossary of terms for sealants for
building purposes (ISO 6927-1981) [CED 13: Building
Construction Practices including Painting, Varnishing and
Allied Finishing]

Jawaharlal Nehru
'Step Out From the Old to the New"

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18:10959 -1984

UPC 693224: 69158:001-4 ( First Reprint AUGUST 1 998 ) ( Re^?Led*2?02^

Indian Standard

GLOSSARY OF TERMS FOR SEALANTS FOR
BUILDING PURPOSES

( ISO Title : Building Construction — Jointing
Products — Sealants — Vocabulary )

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National Foreword

This Indian Standard which is identical with ISO 6927 - 1981 'Building construction — Jointing
products — Sealants — Vocabulary', issued by the International Organization for Standardization
(ISO), was adopted by the Indian Standards Institution on the recommendation of the Building
Construction Practices Sectional Committee and approval of the Civil Engineering Division Council.

Wherever the words 'International Standard' appear, referring to this standard, it should be read as
'Indian Standard'.

Only the English language text in the International Standard has been retained while adopting it
in this Indian Standard. Consequently, foot-notes in relation to French version stand deleted.

Adopted 27 June 1984

September 1984, BIS

Gr 2

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

IS : 10959
ISO 6927

1984
1981

Introduction

This International Standard does not include all
necessary technical terms on jointing products.
The given selection has been based on relations
with other standards and the need for definitions
before specific test methods are elaborated.

Material properties are defined in general terms
without reference to related quantitative aspects
such as the influence of specitic test conditions,
for example, temperature or rate of strain.

1 Scope and field of application

This Internationa! Standard defines technical terms
for sealants for building purposes and applies to
joints filled with hardening, plastic or elastic
materials which are not preformed.

2 Terms and definitions

2.1 to seal : To place the appropriate products in
the joint in order to prevent the penetration of
moisture and/or the passage of air between the
elements, components, and assemblies made of
the same or dissimilar materials.

2.2 sealant : A material which, applied in an
unformed state to a joint, seals it by adhering to
appropriate surfaces within the joint.

2.3 elastic sealant : Sealant which after appli-
cation exhibits predominantly elastic behaviour,
i.e, remaining stresses induced in the sealant as
a result of joint movement are almost proportional
to the strain.

2.4 plastic sealant : A sealant which after appli-
cation retains predominantly plastic properties,
i.e. the remaining stresses induced in the sealant
as a result of joint movement are rapidly relieved.

2.7 Joint movement amplitude

2.7.1 for extension/compression movements :

Difference between the maximum and the mini-
mum width of a given joint caused by extension/
compression movements.

2.7.2 for shearing movements : Maximum
length of the motion, measured in a direction
parallel to the sliding, of two points on the faces
of the joint which were initially located on a line
perpendicular to the axis of the joint.

2.8 movement capability : Quantitative state-
ment of the ability of a sealant to accommodate
movement of the joint into which it has been
filled, while maintaining an effective seal,

2.9 primer : Surface coating applied to the faces
of the joint before placing the sealant in order to
ensure its adhesion.

2.10 back-up material : Material inserted in a
joint, which limits the depth of sealant applied,
and which defines the back profile of the sealant.

2.11 compatibility : For a sealant, the property
of remaining in contact with another material
without unfavourable physical or chemical
interactions.

2.12 cohesion : Property of a sealant subjected
to tensile strain to hold together by intermolecular
attraction.

2.5 one component sealant

use.

Sealant ready for

2.6 multi-component sealant : Sealant suppli-
ed in the form of several separate components to
be mixed together before use, in accordance
with the manufacturer's instructions.

2.13 cohesion failure

a sealant.

Rupture in the body of

2.14 adhesion : Property of a sealant to stick to
a given substrate.

2.15 adhesion failure : Rupture at the interface
between a sealant and a substrate.

2.16 elastic recovery : Property of a sealant
whereby the initial shape and dimensions of the
material are wholly or partially restored on remo-
val of the forces causing deformation.

2.17 slump^) : Flow of a sealant out of a
having a vertical surface.

joint

2.18 secant tensile modulus : Ratio between
the tensile stress of a sealant at a particular rela-
tive elongation and that relative elongation.

1 ) Also designated "sagging"

2.19 application life ; Time after mixing a multi-
component sealant (or after opening a sealed
container of a one-component seajant) within
which the material may be successfully applied to
a joint, at a stated temperature.

2.20 tooling^) : Method used, following appli-
cation, to force the sealant into a joint in order
to ensure contact between the sealant and the
interface and to improve the surface appearance.

2.21 open time of the primer : Time after the
application of the primer during which the sealant
can be successfully applied.

2.22 tack-free time : Time after which a sealant
surface looses its tackiness so that dust no longer
adheres.

2.23 depth of \the sealant : Smallest distance
between the surface of the sealant and its back
profile.

IS : 10959-1984
ISO 6927-1981

2.24 cure : Irreversible transformation of a sealant
from a liquid or paste-like state into a hardened
or rubber-like solid state.

2.25 sealant durability : Probable service life of
a sealant during the given conditions of use.

2.26 service life : Period of time during which a
sealant fulfills its functions.

In practice, the period between the date of the

first application of a sealant to a joint and the

date when the product ceases to fulfil its
functions.

2.27 storage life : Period following manufacture,
during which a sealant stored under defined con-
ditions, may be used and will then maintain its
functional characteristics.^^

1 ) This term covers two actions which Correspond to two different tefms ih Ffeneh, *'3errage lissage".

2) That is, having properties necessary for satisfactory performance*

Reprography Unit. BIS, New Delhi, India